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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
But we don't really know why REM periods get longer in the wee hours, says Daniel A. Barone, MD, an assistant professor of neurology at the Weill Cornell Medical College's Center for Sleep Medicine. One theory, he says, is that REM sleep may somehow prepare you to get your butt out of bed.